Audio interface



FIG. 1 is a front perspective view of an ornamental design for an audio interface;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a first side view thereof;

FIG. 6 is a second side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines that are immediately adjacent to the shaded areas, and define unshaded regions, represent the bounds of the claimed design. All other broken lines depict unclaimed environment. The broken lines form no part of the claimed design. 

The ornamental design for an audio interface, as shown and described. 